Hammer for impact pulverizers



March 2 8, 1939. F. E. SMITH 2,152,332"

HAMMER FOR IMPACT PULVERIZERS I Filed March 11, 1957 2 Sheets-Sheet 1 25 5 I Izflemim" 2a M fbrreatif mzfiz 29 g5 M; Z7 27 l dizome I March 28, 1939. F sMlTH 2,152,332

, HAMMER FOR IMPACT- PULVERIZERS Filed March 11, 1957 2 Sheets-Sheet 2 Indezzzm W [Zr/"eat Z'JmZt/a Patented Mar. 23, 1939 r 2 152 332 UNITED STATES PATENT OFFICE 2,152,332 HAMMER FOR. IMPACT PULvEmzEns .Forrest E. Smith, Chicago, Ill.

Application March 11, 1937, Serial No. 130,223

6 Claims. (01. 83-11} The present invention relates generally to imverized. Suitably mounted in the casing W is a provements -in rotary impact crushers or puldrive shaft is adapted to be connected to a verizers, and has particular reference to a new source of power (not shown) Hammer suspen and improved hammer adapted for use therein. sion means is mounted onthe shaft i3, and in a One of the objects of the present invention the present instance comprises a plurality of .5 is to provide a novel pulverizer hammer in which spaced parallel disks I secured. in fixed relathe part mostsubject to wear is easily and contion. A plurality of hammers is, four in the veniently reversible and renewable. present instance, are suitably secured in un Another object resides in the provision of a formly peripherally spaced relation to the all 1.0 new and improved. impact hammer having a ti it and project radially therefrom. 'I'ne casing 3a which is reversibly and removably connected to 3 i5 ifi ov ed n t e top Portion with line? the hammer arm by an interlocking joint free p t it and in the bottom w a r te t tu from backlash and not likely to break or work cfl generally Circle of levoliifl loose, and which may be provided in various sizes $1011 65 t e hammers l5 and shapes regardless of the pulverizer design. It will b u d d that in use the hammers ii A general object is to provide a novel impact are revolved at very h p Hence, hammer of the foregoing character which is sim- M8 Subjected $30 heavy fi u force and 8350 ple and sturdy in construction and in effect rigid; to severe p t in r du n th mat ial to be with the hammer arm, which is long lived and pulverized- Wear 04301115 at the 011%? edges f an economical in use, and in which'the tip can be the hammer tips, necessitates frequent 2c renewed or reversed with a relatively small explacement of the hammelfipenditure of time. Theprimary feature of the present invention Further objects and advantages will become resides in the provision of an impact hammer apparent as the description proceeds. having a renewable p which is securely In the accompanyin drawin s. nected without lost motion to the hammer arm 25 Figure 1 is a, transverse Sectional View of a and not likely to work loose or break off with pulverizer provided with impact ham resultant damage to the pulverizer, which-can be bodying the features of my inventig'zjg easily and quickly reversed end for end and side Fig, 2 iS a, fragmentary View on an enlarged f0! sifieso as $0 use Of 0111 long? scale of one of the hammers taken along line tlldinal edges before requiring replacement, and; 34;

2-2 of Fig. 1. which upon replacement requires the scrapping Fig. 3 is a fragmentary perspective View of or a comparatively small amount of metal in one of the hammer tips, relation to the amount that can be worn of? Fig. 4 is a fragmentary plan view of amodiin 35 fled form of ham Referring to Figs. 1 to 3, each hammer l5 has 5 Fig. 5 is a i e of the hammer illustrated a reversible and renewable tip I8 in the form of in Fig. 4. a bar or head removably connected at opposite Fig. 6 is an enla d perspective View of the .ends with a strong joint-to the outer ends of two hammer tip illustrated in Figs. 4 and 5. pa allel radia h e arms i9 p c 1onei 40 Fig. 7 is a fragmentary plan View f another tudinally of the shaft 13. :I'hese Joints avoid the 40 modified fo of hammern use of, or reliance on, rivets which would require Fig, 8 i a, fragmentary i View f the hammer an objectional amount of time in reversing or in t t i Fig 7. renewing the tip I8, and also avoid the, use of Fig. 9 is a fragmentary View, partially in Section, bolts or pins which would be likely to work loose. along line 9--9 of Fig. 8. Moreover, such fastening means as rivets, bolts 45 Referring more particularly to the drawings, and i would provide a joint inadequate in the impact hammers embodying the present instrength in view of the heavy centrifugal forces vention are adapted for use in various types and and Severe impact to which the hammer i kinds of crushers or pulverizers, and for purposes jected in use, and hence likely'to break 'Q 50.01 illustration one form of hammer is shown in Wrecking 0f the pulveriZeF- f connection with a rotary pulverizer of conven- The p is has f0u110ngitudin?1'WearinE ge tional design (Fig. 1). The pulverizer comprises 20 to 23 adapted to be e e ec ive y as a casing. I8 which is mounted on a base H and the outer leading impact edge; and is formed which has a feed inlet l2 at one side for the in opposite ends respectively with longitudinal material, such as stone, to be crushed. or pulslots or channels 24 adapted for slidable inter: 55

iswornoutand locking reception of. the outer ends of the hammer arms It. Each slot or channel 2| is cruciform in cross section, and opens radially through the tip I. to the outer and inner faces. An intermediate longitudinal guide groove 25 is formed in each side of the slot 24, and defines parallel oppositely facing abutments or projections 28. The two guide grooves 25 define the relatively wide head portion of the slot 24, and the-projections 2! have outwardly inclined faces 21 defining restricted throat portions opening from the head portion to the outer and inner faces or sides of the hammer tip it. i

The inner ends of the spaced hammer arms it are suitablysecured to the disks it, for example, by means of a removable bolt or pin is. Preferably. each arm is is closely confined between two of the disks N to prevent spreadingr 1 Thtieouter ends of the hammer arms is are comp mentary in shape to the slots 24, and adapted to be assembled therewith by relative sliding movement longitudinally of the hammer tip ll. More particularly, the outer end of each hammer arm I! is cruciform in cross section, and has a wide rectangular head 29 sli able at opposite sides in the guide grooves 25 and coacting with the abutments 26 to provide a strong tight radial interlock with the hammer tip it.

The neck portion of the arm it extends through the inner throat of the slot 24, and preferably has inclined sides 30 closely engaging the projection faces 21. Preferably, the arm I! has a dovetail projection Ii the head "extending into the outer throat o the slot 24, andengaging the outer projection faces 21.

It will be evident that I have provided a'strong and rigid interlock between the hammer tip I I and arms is, The interlock has no radial lost motion and cannot become loose. Assembly may be quickly and conveniently efiected by inserting the outer ends of the arms it into the slots 24. and then securing the arms in fixed position between thedisks ll. Thus, the hammer tip II isheld removably and reversibly between the arms It. When one of the outer edges of the tip it becomes unduly worn, the tip may be reversed end for end to present the other outer edgp in the lead. when both outer edges are worn down,

the tip ll may be reversed about its longitudinal axis to present the other two edges at the outside.

. This reversibility is obtained since the arms It and slots 2. are dimensioned alike for interchangeable engagement and since each slot is provided with two oppositely opening throats. Although the tip is reversible and renewable, no loss in strength is involved. When the tip I! replaced, only a small amount of metal in relation to its wear capacity and be scrapped.

If desired, a transverse groove 82 may be formed in the tip I! at the inner endof each slot. 24 and connecting the inner ends of the grooves 2i, and the-guide head 20 may be elongated ,to project into the groove 22. thereby, in-

creasing the area and strength of the interlock resisting the radialpull set up by centrifugal The hammer permits of flexibility in design. and may be provided'in various sizes and shapes re ardless of the oulvmr design. In the form ofFlgs. 1 to 3. the hammer arms I! are spacedto accommodate relatively long hammer tips ll.

"Figsr'i'to 6 illustrate a modified form of the invention adapted for relatively short hammer.

tips. The construction of the interlocking joints between the hammer tip and arms is substantially the same as in the first form, and hence the corresponding parts thereof are identified by the same reference numerals plus the distinsuishing letter a. 7

In the hammer tip it shown in Fig. 6, the inner ends of the slots 24' are separated by a narrow wall 38, and hence are not formed with shank or arm, and are formed with opposed notches 24 in their outer ends to define a space for the wall 33. The arms l9- are mounted on the pin 28' jointly between two disks l4", and are separably' connected intermediate their ends by a suitable bolt 35. It will be evident that the hammer tip i8 is securely clamped between the arms Il and is interlocked with the outer ends against radial displacement. Even if the bolt 35 should fail or become loose, the interlocking Joints would hold the hammer tip I! in position since spreading of the arms it would be prevented by the disks ll.

The modified form illustrated in Figs. 7 to 9 is adapted for hammer tips of intermediate lengths. The hammer is closely similar to those in Figs. 1 to 6, and hence corresponding parts thereof are identified by the'same reference numerals plus the distinguishing letter b. In this form, the tip it is of such length that the grooves 12'' are defined by opposite ends of a space opening through the wall a". The hammer arms l9 extend in parallel spaced relation and are altermated with the disks it". As in the form of Figs 4 to 6, the arms It arerigidly connected to clamp the tip is between the outer ends. In this inthroats and having an enlarged head slidably disposed in said channel between said throats,

and a projection on the outer end of said head slidably'disposed in the other of said throats.

2. An impact hammer for rotary pulverizers comprising,-in combination, a hammer tip formed with a longitudinal slot opening to one end and having two restricted throats opening respectively to opposite sides, the innerend of said slot opening to a groove, and a hammer arm adapted to extend selectively through one or the other of said throats and having an enlarged head slidably disposed in said slot and projecting into said groove. l

3. An impact hammer for rotary pulverizers comprising, in combination, a hammer tip formed with two longitudinal slots, one opening to each end, eachof said slots having two restricted throats opening respectively toopposite sides, two hammer arms in sideengagement and having spaced guide heads on their outer ends adapted for sliding engagement with said slots in any position of assembly of said tip end for end or side about its longitudinal axis, and means intermediate the ends of said arms inwardly or said tip for rigidly connecting said arms to confine said tip between said heads.

' 4. An impact hammer for rotary pulverizers with two longitudinal slots, one opening to each' end, each slot having two restricted throats opening respectively to opposite sides, two hammer arms having guide heads on their outer ends adapted for closely .fitting sliding engagement with said slots in any position of assembly of said tip end for end or side for side about the longitudinal axis, two lugs formedrespectively on said arms and extending therefrom into overlapping relation, and means for rigidly connecting said lugs soas to cause said arms to confine said tip between said heads.

6. An impact hammer for rotary pulverizers comprising, in combination, an elongated onepiece hammer tip having longitudinal impact faces and edges and being symmetrical and for end and side for side, said tip being formed in opposite ends respectively with longitudinal slots, each slot having two restricted throats which open respectively to opposite sides of said tip and which are formed with outwardly diverging surfaces, and each slot extending inwardly oi the end of said tip beyond said throats to define a groove, two hammer arms having guide heads on their outer ends adapted i'or freely separable sliding engagement with said slots in any position of assembly ofsaid tip end for end or side for side about its longitudinal axis and extending into said grooves, said arms projecting through the throats opening to one side of said tip, two dovetail projections respectively on the outer ends of said arms outwardly of said heads and slidably disposed in the throats opening to the other side of said tip, and means for maintaining said arms in assembledrelation with said tip.

FORREST E. SMITH.

CERTIFICATE OF CORRECTION Patent No. 2,152,552.

March 28, 1959.

FORREST E. SMITH.

i It is hereby certified that error appears in the printed specification of the shove mnn'bered patent requiring correction as follows: Page 2-, second column, iine 7h, claim 5; after the word "side insert for side; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

- Signed and sealed this 6th day of June, A. n. 1959,

Henry Van Arsdale Acting Commissioner of Pat ents. 

